U.S. patent application number 15/320137 was filed with the patent office on 2017-05-11 for apparatus for adjusting steam pressure in a system for drying coal using reheat steam.
The applicant listed for this patent is HANKOOK TECHNOLOGY INC.. Invention is credited to Sung Kon KIM.
Application Number | 20170130152 15/320137 |
Document ID | / |
Family ID | 54935778 |
Filed Date | 2017-05-11 |
United States Patent
Application |
20170130152 |
Kind Code |
A1 |
KIM; Sung Kon |
May 11, 2017 |
APPARATUS FOR ADJUSTING STEAM PRESSURE IN A SYSTEM FOR DRYING COAL
USING REHEAT STEAM
Abstract
The present invention relates to a system for drying coal using
reheat steam, and more particularly, to an apparatus for enhancing
drying efficiency by adjusting reheat steam to be injected to coal
input and transferred onto a transfer device at predetermined
pressure in a multi-stage dryer drying the coal by using reheat
steam and in the apparatus for adjusting steam pressure in a system
for drying coal using reheat steam, a steam supply pipe supplying
the reheat steam generated by a reheater is connected to one side
of each of the first steam chamber, the second steam chamber, the
third steam chamber, and the fourth steam chamber and a first steam
distribution perforated plate with a plurality of steam injection
holes is coupled to and installed in the inner upper part of each
of the first steam chamber, the second steam chamber, the third
steam chamber, and the fourth steam chamber to inject the reheat
steam at uniform pressure through the first steam injection
holes.
Inventors: |
KIM; Sung Kon; (Anyang-si,
Gyeonggi-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HANKOOK TECHNOLOGY INC. |
Seoul |
|
KR |
|
|
Family ID: |
54935778 |
Appl. No.: |
15/320137 |
Filed: |
June 17, 2015 |
PCT Filed: |
June 17, 2015 |
PCT NO: |
PCT/KR2015/006142 |
371 Date: |
December 19, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
Y02P 70/405 20151101;
C10L 2290/08 20130101; F26B 17/026 20130101; Y02P 70/10 20151101;
F26B 3/06 20130101; F26B 17/04 20130101; F26B 23/002 20130101; F26B
3/04 20130101; F26B 23/001 20130101; F26B 17/08 20130101; F26B
21/02 20130101; C10L 9/00 20130101 |
International
Class: |
C10L 9/00 20060101
C10L009/00; F26B 21/02 20060101 F26B021/02; F26B 17/04 20060101
F26B017/04; F26B 23/00 20060101 F26B023/00; F26B 3/04 20060101
F26B003/04; F26B 17/02 20060101 F26B017/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 17, 2014 |
KR |
10-2014-0073213 |
Jun 17, 2014 |
KR |
10-2014-0073216 |
Jun 17, 2014 |
KR |
10-2014-0073221 |
Jun 17, 2014 |
KR |
10-2014-0073223 |
Jan 2, 2015 |
KR |
10-2015-0000084 |
Jan 2, 2015 |
KR |
10-2015-0000093 |
Claims
1. An apparatus for adjusting steam pressure in a system for drying
coal using reheat steam including, a first coal dryer in which a
pair of first drive sprockets and a pair of first driven sprockets
are spaced apart from each other at a predetermined distance to be
fastened to first chains, respectively, a plurality of transfer
plates is hinge-coupled between the first chains, a pair of first
guide rails horizontally supporting the first transfer plate is
installed below an upper second chain connected between the first
drive sprocket and the first driven sprocket, a pair of second
guide rails horizontally supporting the first transfer plate is
installed below a lower first chain connected between the first
drive sprocket and the first driven sprocket, a first steam chamber
injecting reheat steam supplied from a reheater is installed below
the upper first chain, a second steam chamber injecting reheat
steam supplied from the reheater is installed below the lower first
chain, a first exhaust gas chamber collecting exhaust gas is
installed on the upper first chain, and a second exhaust gas
chamber collecting exhaust gas is installed on the lower first
chain, and a second coal dryer in which a pair of second drive
sprockets and a pair of second driven sprockets are spaced apart
from each other at a predetermined distance to be fastened to
second chains, respectively, a plurality of transfer plates is
hinge-coupled between the second chains, a pair of second guide
rails horizontally supporting the second transfer plate is
installed below an upper second chain connected between the second
drive sprocket and the second driven sprocket, a pair of second
guide rails horizontally supporting the second transfer plate is
installed below a lower second chain connected between the second
drive sprocket and the second driven sprocket, a third steam
chamber injecting reheat steam supplied from the reheater is
installed below the upper second chain, a fourth steam chamber
injecting reheat steam supplied from the reheater is installed
below the lower second chain, a third exhaust gas chamber
collecting exhaust gas is installed on the upper second chain, and
a fourth exhaust gas chamber collecting exhaust gas is installed on
the lower second chain, coal which is primarily dried in the first
coal dryer being inputted into the second coal dryer and thus
secondarily dried, wherein: a steam supply pipe supplying the
reheat steam generated by a reheater is connected to one side of
each of the first steam chamber, the second steam chamber, the
third steam chamber, and the fourth steam chamber and a first steam
distribution perforated plate with a plurality of steam injection
holes is coupled to and installed in the inner upper part of each
of the first steam chamber, the second steam chamber, the third
steam chamber, and the fourth steam chamber to inject the reheat
steam at uniform pressure through the first steam injection
holes.
2. An apparatus for adjusting steam pressure in a system for drying
coal using reheat steam including, a first coal dryer in which a
pair of first drive sprockets and a pair of first driven sprockets
are spaced apart from each other at a predetermined distance to be
fastened to first chains, respectively, a plurality of transfer
plates is hinge-coupled between the first chains, a pair of first
guide rails horizontally supporting the first transfer plate is
installed below an upper second chain connected between the first
drive sprocket and the first driven sprocket, a pair of second
guide rails horizontally supporting the first transfer plate is
installed below a lower first chain connected between the first
drive sprocket and the first driven sprocket, a first steam chamber
injecting reheat steam supplied from a reheater is installed below
the upper first chain, a second steam chamber injecting reheat
steam supplied from the reheater is installed below the lower first
chain, a first exhaust gas chamber collecting exhaust gas is
installed on the upper first chain, and a second exhaust gas
chamber collecting exhaust gas is installed on the lower first
chain, a second coal dryer in which a pair of second drive
sprockets and a pair of second driven sprockets are spaced apart
from each other at a predetermined distance to be fastened to
second chains, respectively, a plurality of transfer plates is
hinge-coupled between the second chains, a pair of second guide
rails horizontally supporting the second transfer plate is
installed below an upper second chain connected between the second
drive sprocket and the second driven sprocket, a pair of second
guide rails horizontally supporting the second transfer plate is
installed below a lower second chain connected between the second
drive sprocket and the second driven sprocket, a third steam
chamber injecting reheat steam supplied from the reheater is
installed below the upper second chain, a fourth steam chamber
injecting reheat steam supplied from the reheater is installed
below the lower second chain, a third exhaust gas chamber
collecting exhaust gas is installed on the upper second chain, and
a fourth exhaust gas chamber collecting exhaust gas is installed on
the lower second chain, and a coal constant feeder including a
first transfer roller hinge-coupled between two-side centers of the
first transfer plate and the first chains, respectively, at left
and right sides of the first transfer roller, first auxiliary
rollers hinge-coupled with the sides of the first transfer plate,
respectively, second transfer rollers hinge-coupled between both
centers of the second transfer plate and the second chains,
respectively, at left and right sides of the second transfer
roller, second auxiliary rollers hinge-coupled with the sides of
the second transfer plate, respectively, a first guide bar rotating
and up-supporting the lower first transfer plate separated from the
second guide rail in one direction installed from the top to the
bottom of the first drive sprocket along the side, a second guide
bar rotating and down-supporting the upper first transfer plate
separated from the first guide rail installed from the bottom to
the top of the first driven sprocket along the side, a third guide
bar rotating and up-supporting the lower second transfer plate
separated from the fourth guide rail in one direction installed
from the top to the bottom of the second drive sprocket along the
side, and a fourth guide bar rotating and down-supporting the upper
second transfer plate separated from the third guide rail installed
from the bottom to the top of the second driven sprocket along the
side and supplying coal of a predetermined amount onto the upward
surface of the first transfer plate, coal which is primarily dried
in the first coal dryer being inputted into the second coal dryer
and thus secondarily dried, wherein: a steam supply pipe supplying
the reheat steam generated by a reheater is connected to one side
of each of the first steam chamber, the second steam chamber, the
third steam chamber, and the fourth steam chamber and a first steam
distribution perforated plate with a plurality of steam injection
holes is coupled to and installed in the inner upper part of each
of the first steam chamber, the second steam chamber, the third
steam chamber, and the fourth steam chamber to inject the reheat
steam at uniform pressure through the first steam injection
holes.
3. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a perforation
ratio of the first steam injection holes to an entire area of the
first steam distribution perforated plate is 10 to 15%.
4. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a first stopper
horizontally supporting the first steam distribution perforated
plate is installed on each of the inner walls of the first to
fourth steam chambers to protrude.
5. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a first support
member is fixed to a first fixation member provided on the bottom
of the first steam distribution perforated plate installed inside
each of the first to fourth steam chambers, a second support member
is fixed to a second fixation member provided on the bottom inside
each of the first to fourth steam chambers, a plurality of elastic
supports to which an elastic body having elastic force having a
predetermined magnitude is coupled is installed between the first
support member and the second support member, the first elastic
support is installed to support the first steam distribution
perforated plate to form the first space part with the first to
fourth steam chambers and the first steam distribution perforated
plate is lifted with steam pressure which flows in the first space
part to constantly maintain reheat steam injection pressure through
the first steam injection holes.
6. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 5, wherein a pocket covers
the outer periphery of the first elastic support.
7. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a second steam
distribution perforated plate where a plurality of second steam
injection holes is formed to penetrate is installed on the top or
the bottom of the first steam distribution perforated plate
installed in each of the first to fourth steam chambers.
8. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 7, wherein the perforation
ratio of the second steam injection holes to the entire area of the
first steam distribution perforated plate is 10 to 15%.
9. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 7, wherein a second stopper
horizontally supporting the second steam distribution perforated
plate is installed on each of the inner walls of the first to
fourth steam chambers to protrude.
10. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 7, wherein a first support
member is fixed to a third fixation member provided on the bottom
of the second steam distribution perforated plate, a second support
member is fixed to a fourth fixation member provided on the surface
of the first steam distribution perforated plate, a plurality of
second elastic supports to which an elastic body having elastic
force having a predetermined magnitude is coupled is installed
between the first support member and the second support member, the
second elastic support is installed to support the second steam
distribution perforated plate to form the second space part with
the first steam distribution perforated plate, and the second steam
distribution perforated plate is lifted with steam pressure which
flows in the second space part to constantly maintain reheat steam
injection pressure through the second steam injection holes.
11. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 10, wherein the pocket
covers the outer periphery of the second elastic support.
12. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein guards are
integrally coupled to left and right tops of the transfer plates,
shield plates are integrally coupled to left and right bottoms of
the transfer plates, one side of a steam pressure adjuster having
elasticity is fixedly installed on each of both side walls of the
steam chamber installed below the transfer plates, and when the
steam pressure of the reheat steam transferred from the steam
chamber is equal to or more than the predetermined pressure while
the surface of the steam pressure adjuster contact the bottoms of
the shield plates, the steam pressure presses the steam pressure
adjuster having the elasticity to discharge the reheat steam
between the steam pressure adjuster and the shield plates.
13. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 12, wherein the steam
pressure adjuster is constituted by an elastic member having the
elasticity in a plate shape or a U shape.
14. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 12, wherein the steam
pressure adjuster is hinge-coupled to a fixation plate of which one
side is fixed to each of both side walls of the steam chamber, an
operation plate of which the surface contacts the bottom of the
shield plate, and the other side of the fixation plate and one side
of the operation plate to be elastically supported by a spring.
15. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a steam pressure
adjuster is installed, in which a guide plate in which guards are
integrally coupled to the left and right tops of the transfer
plates, the shield plates are integrally coupled to the left and
right bottoms of the transfer plates, one side is fixedly installed
on each of both side walls of the steam chamber installed below the
transfer plates, a long hole is formed at the center, and a
plurality of through-holes are formed at both sides of the long
hole at a predetermined interval, an operation member installed on
the top of the guide plate to contact the shield plates, an
elevation plate formed to protrude downward on the bottom of the
operation member and elevated while being inserted into the long
hole, and a plurality of guide rods formed to protrude downward on
the bottom of the operation member and elevated while being
inserted into the through-hole and elastically supported by the
spring between the bottom of the operation member and the surface
of the guide plate are coupled to each other, and when the steam
pressure of the reheat steam transferred from the steam chamber is
equal to or more than the predetermined pressure while the surface
of the steam pressure adjuster contact the bottoms of the shield
plates, the steam pressure presses the steam pressure adjuster
having the elasticity to discharge the reheat steam between the
steam pressure adjuster and the shield plates, thereby adjusting
the steam pressure at predetermined pressure or more.
16. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 15, wherein one surface of
the operation member contacts the side wall of the steam
chamber.
17. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 15, wherein an interruption
protrusion is installed to protrude in an outside horizontal
direction on the side wall of the steam chamber and the
interruption protrusion contacts the side of the operation
member.
18. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, further comprising: a
first injection cap coupled to the respective through-holes on the
first transfer plate to protrude in a cylindrical shape, having one
or more first injection holes formed to penetrate on the top
thereof, and a plurality of second injection holes formed to
penetrate on the side thereof; and a second injection cap coupled
to the respective through-holes formed on the second transfer plate
to protrude in the cylindrical shape, having one or more first
injection holes formed to penetrate on the top thereof, and a
plurality of second injection holes formed to penetrate on the side
thereof, wherein the first injection cap disperses and injects the
reheat steam injected by each of the first steam chamber and the
second steam chamber to the top and the side by penetrating a coal
pile loaded and transferred onto the upward surface of the upper
and lower first transfer plates, and the second injection cap
disperses and injects the reheat steam injected by each of the
third steam chamber and the fourth steam chamber to the top and the
side by penetrating the coal pile loaded and transferred onto the
upward surface of the upper and lower second transfer plates.
19. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 18, wherein a pressure
maintaining member dispersing the pressure of the reheat steam into
the first injection cap and the second injection cap is coupled to
each support piece.
20. The apparatus for adjusting steam pressure in a system for
drying coal using reheat steam of claim 1, wherein a plurality of
branched distribution steam supply pipes is connected to the first
to fourth steam chambers.
Description
TECHNICAL FIELD
[0001] The present invention relates to a system for drying coal
using reheat steam, and more particularly, to an apparatus for
enhancing drying efficiency by adjusting reheat steam to be
injected to coal input and transferred onto a transfer device at
predetermined pressure in a multi-stage dryer drying the coal by
using reheat steam.
BACKGROUND ART
[0002] In general, a thermal power plant generating power by using
coal as fuel combusts coal of approximately 180 ton/hr per 500 MW
and supplies coal equivalent to approximately 37 ton per one
pulverizer to a boiler. In the 500 MW thermal power plant using the
coal, approximately 6 coal storages having a capacity of
approximately 500 ton are installed and in 5 coal storages, the
coal is normally supplied and one remaining coal storage is
operated as a coal yard capable of reserving coal which may be
preliminarily used during a predetermined period.
[0003] Moreover, in the thermal power plant using the coal as the
fuel, a standard thermal power design criterion for the coal is
designed to use low-moisture bituminous coal of 6,080 Kcal/Kg and
10% or less. In some thermal power plant, imported coal is used and
some bituminous coal among the imported coal average moisture
content of 17% or more may be provided to decrease combustion
efficiency of the boiler. When a calorific value of coal using
5,400 Kcal/Kg as a standard thermal power combustion limit is low,
it is anticipated that a power generation amount decreases and fuel
consumption increases due to the decrease in combustion efficiency.
Moreover, when subbituminous coal which is high-moisture low
calorific coal is used, a moisture content is higher than a design
criterion, and as a result, a transport system transporting the
coal is not smooth and when the coal is pulverized by the
pulverizer, efficiency decreases and the combustion efficiency
decreases due to partial incomplete combustion, and unbalance of
heat distribution, which occurs in the boiler and the boiler may
also operate in an abnormal state. However, in the thermal power
plant, a use weight of the subbituminous coal gradually increases
up to approximately 41 to 60% in order to reduce fuel cost.
[0004] Further, preference to the thermal power plant increases due
to anticipations of a global business recovery and confronting a
safety problem due to breakage of a nuclear power plant by a big
earthquake of Japan, and as a result, it is expected that the
demand and cost of the coal will continuously increase. As an
environment of a global coal market is changed from a consumer to a
supplier, stable supply and demand of the coal are actually
difficult and a yield of the high caloric coal is prospected to be
maintained at a current level, and as a result, the unbalance of
the supply and demand of the coal is anticipated.
[0005] The low caloric coal in total global coal deposits is
approximately 47% and the deposits are large, but the caloric value
is small and the moisture content is high, and as a result, it is
difficult to completely combust the high-moisture low caloric coal
due to a combustion failure, and the like during combustion.
Therefore, the high-moisture low caloric coal is disregarded on the
market. Globally, a tendency to depend on a stable price of
petroleum and low-priced production cost of the nuclear power
generation has been high in recent years, but construction of a lot
of thermal power plants using the coal has been planned due to a
rapid increase of a petroleum price and anxiety about the nuclear
power generation in recent years.
[0006] As a technique (thermal drying) that dries the coal in the
related art, a rotary drying method that dries coal particles in a
cylindrical shell with high-temperature gas while rotating the
cylindrical shell into which the coal is input, a flash (pneumatic)
drying method that dries the coal by lifting the high-temperature
dry gas from the bottom to the top while supplying the coal from
the top to the bottom, and a fluid-bed drying method that dries the
coal while the high-temperature dry gas is lifted up while
accompanying minute particles are primarily used.
[0007] The coal is divided into surface moisture attached to a
porosity between the coal particles and coupling moisture coupled
to air holes in the coal. As the surface moisture, most moisture
sprayed during a washing process, and transport and storage in a
district and the amount of the surface moisture is determined
according to a surface area and absorptiveness and as the particles
are smaller, the surface area increases and a capillary is formed
between the particles to contain the moisture, thereby increasing
the moisture content. The coupling moisture is formed at a
generation time of the coal and the amount of the coupling moisture
is the smaller in the order of brown coal, soft coal (bituminous
coal and subbituminous coal), and anthracite coal. When the coal
has much moisture, the caloric value decreases and transport cost
increases, and as a result, controlling the moisture is required
during processes such as mixture, pulverization, separation, and
the like of the coal.
[0008] Moreover, in a multi-stage dryer, that is, a device that
dries the coal by spaying high-temperature reheat steam below a
dryer while transporting the pulverized coal through a conveyor
with a plurality of through-holes through which reheat steam passes
or a plurality of coupled transport plates, since the reheat steam
is not injected to the coal input onto the transfer plate at
uniform pressure, the moisture included in the coal cannot be
effectively dried. As a result, the number of stages and the length
of the dryer for drying the coal needs to be increased and a supply
amount of the reheat steam for drying increases, cost and time
required for drying the coal increase.
[0009] As prior art associated with the present invention, Korean
Patent Registration No. 10-1216827 discloses that a steam conveyor
belt transferring coal is installed in a duct of an overheat steam
drying system, an overheat steam supply pipe is connected to the
duct, and overheat steam is injected onto the transferred coal from
an overheat steam injection pipe. However, the overheat steam is
injected only on the surface of the coal input onto the steam
conveyor belt or the overheat steam is not effectively injected up
to a coal particle or a porosity in a part where the coal is
crumpled or a density is high, and as a result, drying efficiency
may deteriorate.
DISCLOSURE
Technical Problem
[0010] An embodiment of the present invention is directed to
effectively dry coal by injecting reheat steam the coal at uniform
pressure while coal input into a dryer is transferred to a transfer
device in a coal drying system that dries the coal using reheat
steam while transferring coal used as fuel of a thermal power
plant.
[0011] Another embodiment of the present invention is directed to
reduce fuel consumption by maintaining an optimum water content of
coal due to effective drying of coal to enhance a calorific value
of coal and improving combustion efficiency of a boiler of the
thermal power plant.
[0012] Yet embodiment of the present invention is directed to
provide a drying technology to prevent environmental problems due
to incomplete combustion of coal by controlling moisture contained
in coal and a technology applied to the thermal power plant.
Technical Solution
[0013] According to an aspect of the present invention, provided is
an apparatus for adjusting steam pressure in a system for drying
coal using reheat steam including a first coal dryer in which a
pair of first drive sprockets and a pair of first driven sprockets
are spaced apart from each other at a predetermined distance to be
fastened to first chains, respectively, a plurality of transfer
plates is hinge-coupled between the first chains, a pair of first
guide rails horizontally supporting the first transfer plate is
installed below an upper second chain connected between the first
drive sprocket and the first driven sprocket, a pair of second
guide rails horizontally supporting the first transfer plate is
installed below a lower first chain connected between the first
drive sprocket and the first driven sprocket, a first steam chamber
injecting reheat steam supplied from a reheater is installed below
the upper first chain, a second steam chamber injecting reheat
steam supplied from the reheater is installed below the lower first
chain, a first exhaust gas chamber collecting exhaust gas is
installed on the upper first chain, and a second exhaust gas
chamber collecting exhaust gas is installed on the lower first
chain, and a second coal dryer in which a pair of second drive
sprockets and a pair of second driven sprockets are spaced apart
from each other at a predetermined distance to be fastened to
second chains, respectively, a plurality of transfer plates is
hinge-coupled between the second chains, a pair of second guide
rails horizontally supporting the second transfer plate is
installed below an upper second chain connected between the second
drive sprocket and the second driven sprocket, a pair of second
guide rails horizontally supporting the second transfer plate is
installed below a lower second chain connected between the second
drive sprocket and the second driven sprocket, a third steam
chamber injecting reheat steam supplied from the reheater is
installed below the upper second chain, a fourth steam chamber
injecting reheat steam supplied from the reheater is installed
below the lower second chain, a third exhaust gas chamber
collecting exhaust gas is installed on the upper second chain, and
a fourth exhaust gas chamber collecting exhaust gas is installed on
the lower second chain, coal which is primarily dried in the first
coal dryer being inputted into the second coal dryer and thus
secondarily dried, wherein a steam supply pipe supplying the reheat
steam generated by a reheater is connected to one side of each of
the first steam chamber, the second steam chamber, the third steam
chamber, and the fourth steam chamber and a first steam
distribution perforated plate with a plurality of steam injection
holes is coupled to and installed in the inner upper part of each
of the first steam chamber, the second steam chamber, the third
steam chamber, and the fourth steam chamber to inject the reheat
steam at uniform pressure through the first steam injection
holes.
[0014] According to another aspect of the present invention,
provided is an apparatus for adjusting steam pressure in a system
for drying coal using reheat steam including a first coal dryer in
which a pair of first drive sprockets and a pair of first driven
sprockets are spaced apart from each other at a predetermined
distance to be fastened to first chains, respectively, a plurality
of transfer plates is hinge-coupled between the first chains, a
pair of first guide rails horizontally supporting the first
transfer plate is installed below an upper second chain connected
between the first drive sprocket and the first driven sprocket, a
pair of second guide rails horizontally supporting the first
transfer plate is installed below a lower first chain connected
between the first drive sprocket and the first driven sprocket, a
first steam chamber injecting reheat steam supplied from a reheater
is installed below the upper first chain, a second steam chamber
injecting reheat steam supplied from the reheater is installed
below the lower first chain, a first exhaust gas chamber collecting
exhaust gas is installed on the upper first chain, and a second
exhaust gas chamber collecting exhaust gas is installed on the
lower first chain, a second coal dryer in which a pair of second
drive sprockets and a pair of second driven sprockets are spaced
apart from each other at a predetermined distance to be fastened to
second chains, respectively, a plurality of transfer plates is
hinge-coupled between the second chains, a pair of second guide
rails horizontally supporting the second transfer plate is
installed below an upper second chain connected between the second
drive sprocket and the second driven sprocket, a pair of second
guide rails horizontally supporting the second transfer plate is
installed below a lower second chain connected between the second
drive sprocket and the second driven sprocket, a third steam
chamber injecting reheat steam supplied from the reheater is
installed below the upper second chain, a fourth steam chamber
injecting reheat steam supplied from the reheater is installed
below the lower second chain, a third exhaust gas chamber
collecting exhaust gas is installed on the upper second chain, and
a fourth exhaust gas chamber collecting exhaust gas is installed on
the lower second chain, and a coal constant feeder including a
first transfer roller hinge-coupled between two-side centers of the
first transfer plate and the first chains, respectively, at left
and right sides of the first transfer roller, first auxiliary
rollers hinge-coupled with the sides of the first transfer plate,
respectively, second transfer rollers hinge-coupled between both
centers of the second transfer plate and the second chains,
respectively, at left and right sides of the second transfer
roller, second auxiliary rollers hinge-coupled with the sides of
the second transfer plate, respectively, a first guide bar rotating
and up-supporting the lower first transfer plate separated from the
second guide rail in one direction installed from the top to the
bottom of the first drive sprocket along the side, a second guide
bar rotating and down-supporting the upper first transfer plate
separated from the first guide rail installed from the bottom to
the top of the first driven sprocket along the side, a third guide
bar rotating and up-supporting the lower second transfer plate
separated from the fourth guide rail in one direction installed
from the top to the bottom of the second drive sprocket along the
side, and a fourth guide bar rotating and down-supporting the upper
second transfer plate separated from the third guide rail installed
from the bottom to the top of the second driven sprocket along the
side and supplying coal of a predetermined amount onto the upward
surface of the first transfer plate, coal which is primarily dried
in the first coal dryer being inputted into the second coal dryer
and thus secondarily dried, wherein a steam supply pipe supplying
the reheat steam generated by a reheater is connected to one side
of each of the first steam chamber, the second steam chamber, the
third steam chamber, and the fourth steam chamber and a first steam
distribution perforated plate with a plurality of steam injection
holes is coupled to and installed in the inner upper part of each
of the first steam chamber, the second steam chamber, the third
steam chamber, and the fourth steam chamber to inject the reheat
steam at uniform pressure through the first steam injection
holes.
[0015] Further, in the present invention, a perforation ratio of
the first steam injection holes to an entire area of the first
steam distribution perforated plate may be 10 to 15%. In addition,
in the present invention, a first stopper horizontally supporting
the first steam distribution perforated plate may be installed on
each of the inner walls of the first to fourth steam chambers to
protrude.
[0016] Moreover, in the present invention, a first support member
may be fixed to a first fixation member provided on the bottom of
the first steam distribution perforated plate installed inside each
of the first to fourth steam chambers, a second support member may
be fixed to a second fixation member provided on the bottom inside
each of the first to fourth steam chambers, a plurality of elastic
supports to which an elastic body having elastic force having a
predetermined magnitude is coupled may be installed between the
first support member and the second support member, the first
elastic support may be installed to support the first steam
distribution perforated plate to form the first space part with the
first to fourth steam chambers and the first steam distribution
perforated plate is lifted with steam pressure which flows in the
first space part to constantly maintain reheat steam injection
pressure through the first steam injection holes.
[0017] In addition, in the present invention, a pocket may cover
the outer periphery of the first elastic support.
[0018] Further, in the present invention, a second steam
distribution perforated plate where a plurality of second steam
injection holes is formed to penetrate may be installed on the top
or the bottom of the first steam distribution perforated plate
installed in each of the first to fourth steam chambers.
[0019] Moreover, in the present invention, the perforation ratio of
the second steam injection holes to the entire area of the first
steam distribution perforated plate may be 10 to 15%. In addition,
in the present invention, a second stopper horizontally supporting
the second steam distribution perforated plate may be installed on
each of the inner walls of the first to fourth steam chambers to
protrude.
[0020] Further, in the present invention, a first support member
may be fixed to a third fixation member provided on the bottom of
the second steam distribution perforated plate, a second support
member may be fixed to a fourth fixation member provided on the
surface of the first steam distribution perforated plate, a
plurality of second elastic supports to which an elastic body
having elastic force having a predetermined magnitude is coupled
may be installed between the first support member and the second
support member, the second elastic support may be installed to
support the second steam distribution perforated plate to form the
second space part with the first steam distribution perforated
plate, and the second steam distribution perforated plate is lifted
with steam pressure which flows in the second space part to
constantly maintain reheat steam injection pressure through the
second steam injection holes.
[0021] In addition, in the present invention, the pocket may cover
the outer periphery of the second elastic support.
[0022] Further, in the present invention, guards may be integrally
coupled to left and right tops of the transfer plates, shield
plates may be integrally coupled to left and right bottoms of the
transfer plates, one side of a steam pressure adjuster having
elasticity may be fixedly installed on each of both side walls of
the steam chamber installed below the transfer plates, and when the
steam pressure of the reheat steam transferred from the steam
chamber is equal to or more than the predetermined pressure while
the surface of the steam pressure adjuster contact the bottoms of
the shield plates, the steam pressure presses the steam pressure
adjuster having the elasticity to discharge the reheat steam
between the steam pressure adjuster and the shield plates.
[0023] In addition, in the present invention, the steam pressure
adjuster may be constituted by an elastic member having the
elasticity in a plate shape or a U shape.
[0024] Further, in the present invention, the steam pressure
adjuster may be hinge-coupled to a fixation plate of which one side
is fixed to each of both side walls of the steam chamber, an
operation plate of which the surface contacts the bottom of the
shield plate, and the other side of the fixation plate and one side
of the operation plate to be elastically supported by a spring.
[0025] Moreover, in the present invention, a steam pressure
adjuster may be installed, in which a guide plate in which guards
are integrally coupled to the left and right tops of the transfer
plates, the shield plates are integrally coupled to the left and
right bottoms of the transfer plates, one side is fixedly installed
on each of both side walls of the steam chamber installed below the
transfer plates, a long hole is formed at the center, and a
plurality of through-holes are formed at both sides of the long
hole at a predetermined interval, an operation member installed on
the top of the guide plate to contact the shield plates, an
elevation plate formed to protrude downward on the bottom of the
operation member and elevated while being inserted into the long
hole, and a plurality of guide rods formed to protrude downward on
the bottom of the operation member and elevated while being
inserted into the through-hole and elastically supported by the
spring between the bottom of the operation member and the surface
of the guide plate are coupled to each other, and when the steam
pressure of the reheat steam transferred from the steam chamber is
equal to or more than the predetermined pressure while the surface
of the steam pressure adjuster contact the bottoms of the shield
plates, the steam pressure presses the steam pressure adjuster
having the elasticity to discharge the reheat steam between the
steam pressure adjuster and the shield plates, thereby adjusting
the steam pressure at predetermined pressure or more.
[0026] Further, in the present invention, one surface of the
operation member may contact the side wall of the steam
chamber.
[0027] Moreover, in the present invention, an interruption
protrusion may be installed to protrude in an outside horizontal
direction on the side wall of the steam chamber and the
interruption protrusion contacts the side of the operation
member.
[0028] Further, in the present invention, the apparatus may further
include a first injection cap coupled to the respective
through-holes on the first transfer plate to protrude in a
cylindrical shape, having one or more first injection holes formed
to penetrate on the top thereof, and a plurality of second
injection holes formed to penetrate on the side thereof; and a
second injection cap coupled to the respective through-holes formed
on the second transfer plate to protrude in the cylindrical shape,
having one or more first injection holes formed to penetrate on the
top thereof, and a plurality of second injection holes formed to
penetrate on the side thereof, wherein the first injection cap
disperses and injects the reheat steam injected by each of the
first steam chamber and the second steam chamber to the top and the
side by penetrating a coal pile loaded and transferred onto the
upward surface of the upper and lower first transfer plates, and
the second injection cap disperses and injects the reheat steam
injected by each of the third steam chamber and the fourth steam
chamber to the top and the side by penetrating the coal pile loaded
and transferred onto the upward surface of the upper and lower
second transfer plates.
[0029] In addition, in the present invention, pressure maintaining
member dispersing the pressure of the reheat steam into the first
injection cap and the second injection cap may be coupled to each
support piece.
[0030] Further, in the present invention, a plurality of branched
distribution steam supply pipes may be connected to the first to
fourth steam chambers.
Advantageous Effects
[0031] According to the present invention, incomplete combustion of
coal is prevented by removing moisture which remains on the surface
and to the inside of coal which is used fuel of a thermal power
plant by injecting high-temperature reheat steam onto the surface
of the coal and to the inside of the coal at uniform pressure in a
multi-stage coal dryer to enhance a caloric value of the coal and
minimize emission of pollutant materials, prevent corrosion and
durability of a system, reduce spontaneous ignition rate depending
on reduction of moisture, enhance pulverization efficiency of a
coal pulverizer and a thermal distribution of a power generation
boiler when the coal is combusted, resolve a movement passage
clogging phenomenon, and enhance stability of coal supply by
increasing utilization of low-grade coal having a small demand.
Further, it is possible to use low calorific coal which is cheaper
than high calorific coal, reduce fuel costs and costs due to
reduction in coal import amount, and reduce emission of waste and
pollutants generated from exhaust gas and reduce carbon dioxide by
relatively decreasing coal consumption.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] FIG. 1 is a block diagram illustrating a system for drying
coal using reheat steam according to the present invention.
[0033] FIG. 2 is a configuration diagram illustrating the front
side of the system for drying coal using reheat steam according to
the present invention.
[0034] FIG. 3 is a configuration diagram illustrating the side of
the system for drying coal using reheat steam according to the
present invention.
[0035] FIG. 4 is a perspective view illustrating a main part where
a reheat steam supply chamber is installed in the system for drying
coal using reheat steam according to the present invention.
[0036] FIG. 5 is a perspective view illustrating a reheat steam
supply chamber in the system for drying coal using reheat steam, as
a first embodiment of the present invention.
[0037] FIG. 6 is a cross-sectional view illustrating an operation
of the reheat steam supply chamber according to the present
invention.
[0038] FIG. 7 is a perspective view illustrating the reheat steam
supply chamber as a modified example according to the present
invention.
[0039] FIG. 8 is a cross-sectional view illustrating an operation
of FIG. 7.
[0040] FIG. 9 is a perspective view illustrating that a
distribution steam supply pipe is connected to the reheat steam
supply chamber according to the present invention. FIG. 10 is a
perspective view illustrating a main part where a reheat steam
supply chamber in a system for drying coal using reheat steam, as a
second embodiment of the present invention.
[0041] FIG. 11 is a perspective view illustrating an elastic
support operation of the reheat steam supply chamber according to
the present invention.
[0042] FIGS. 12a and 12b are cross-sectional views illustrating an
operation of the reheat steam supply chamber according to the
present invention.
[0043] FIG. 13 is a cross-sectional view illustrating the reheat
steam supply chamber as a modified example according to the present
invention.
[0044] FIG. 14 is a perspective view illustrating that a steam
pressure adjuster is installed in a reheat steam supply chamber in
a system for drying coal using reheat steam, as a third embodiment
of the present invention.
[0045] FIG. 15 is a side view illustrating the coal drying system
in which the reheat steam supply chamber is installed in the reheat
steam supply chamber according to the present invention.
[0046] FIGS. 16a and 16b are cross-sectional views illustrating an
operation of the steam pressure adjuster installed in the reheat
steam supply chamber according to the present invention.
[0047] FIG. 17 is a cross-sectional view illustrating that the
steam pressure adjuster is installed in the reheat steam supply
chamber as a modified example according to the present
invention.
[0048] FIGS. 18a and 18b are cross-sectional views illustrating an
operation of the steam pressure adjuster installed in the reheat
steam supply chamber according to the present invention.
[0049] FIG. 19 is a cross-sectional view illustrating that the
steam pressure adjuster is installed in the reheat steam supply
chamber as a modified example according to the present
invention.
[0050] FIGS. 20a and 20b are cross-sectional views illustrating an
operation of the steam pressure adjuster installed in the reheat
steam supply chamber according to the present invention.
[0051] FIG. 21 is a perspective view illustrating that a steam
pressure adjuster is installed in a reheat steam supply chamber in
a system for drying coal using reheat steam, as a fourth embodiment
of the present invention.
[0052] FIG. 22 is a side view illustrating the coal drying system
in which the reheat steam supply chamber is installed in the reheat
steam supply chamber according to the present invention.
[0053] FIGS. 23a and 23b are cross-sectional views illustrating an
operation of the steam pressure adjuster installed in the reheat
steam supply chamber according to the present invention.
[0054] FIGS. 24 and 25 are cross-sectional views illustrating
modified examples of the steam pressure adjuster installed in the
reheat steam supply chamber according to the present invention,
respectively.
[0055] FIGS. 26 and 27 are perspective views illustrating a main
part where a transfer plate coupled with an injection cap and a
reheat steam supply chamber are installed in a system for drying
coal using reheat steam, as a fifth embodiment of the present
invention.
[0056] FIG. 28 is a perspective view of the injection cap coupled
to the transfer plate according to the present invention.
[0057] FIG. 29a is a cross-sectional view illustrating the
injection cap coupled to the transfer plate according to the
present invention and FIG. 29b is a cross-sectional view
illustrating an operation of the injection cap.
[0058] FIG. 30 is a perspective view illustrating another example
of the injection cap coupled to the transfer plate according to the
present invention.
[0059] FIGS. 31 and 32 are perspective views illustrating a main
part where a reheat steam supply chamber is installed in a system
for drying coal using reheat steam, as a sixth embodiment of the
present invention.
[0060] FIG. 33 is an exploded perspective view illustrating a main
part of a transfer device in the system for drying coal using
reheat steam according to the present invention.
[0061] FIGS. 34 and 35 are cross-sectional views illustrating an
operation of the transfer device in the system for drying coal
using reheat steam according to the present invention,
respectively.
BEST MODE FOR THE INVENTION
[0062] Hereinafter, an apparatus for adjusting steam pressure in a
system for drying coal using reheat steam according to the present
invention will be described in detail with reference to the
accompanying drawings.
[0063] According to the present invention, reheat steam at uniform
pressure is injected to coal having a predetermined moisture
content, which is input onto a transfer device in which a plurality
of through-holes is formed to penetrate when the coal is dried
while being transferred by using the transfer device such as a
conveyor or a transfer plate to increase a drying effect of the
coal. Moreover, a steam chamber that supplies the reheat steam is
installed below the transfer device of the coal drying system and
injects high-temperature reheat steam generated and supplied by a
reheater at predetermined pressure while pulverized coal is
transferred to the transfer device to dry the coal.
[0064] In FIG. 1, a coal yard 200 keeps and stores coal used as
boiler fuel of a thermal power plant. The coal contains surface
moisture and internal moisture. Further, the coal stored in the
coal yard 200 is periodically sprayed with water to prevent
scattering of coal dust. The coal stored in the coal yard 200 is
transferred to a coal drying system 100 through a transfer means
such as a conveyor system. In this case, the coal in the coal yard
10 from which the moisture is removed may be transferred and stored
into a coal supply tank 300 for drying connected with the coal
drying system. In addition, the coal stored in the coal supply tank
300 is supplied to the coal drying system 100 from a coal constant
feeder 400 with a predetermined amount. The coal drying system 100
includes a third coal dryer 170 for naturally drying the coal
discharged through a first coal dryer 110 and a second coal dryer
170 installed in multiple layers. The first coal dryer 110 and the
second coal dryer 140 have substantially the same structure. The
coal naturally dried through the third coal dryer 170 is stored in
a dried coal reservoir 600 and then, supplied as boiler fuel of a
thermal power plant 700.
[0065] FIG. 2 illustrates an example of a coal drying system 100 in
which a steam chamber supplying reheat steam is installed in the
system for drying coal according to the present invention. The coal
drying system 100 includes a multi-stage dryer, that is, the first
coal dryer 110 drying the coal input from the coal constant feeder
400, the second coal dryer 140 secondarily drying the coal dried by
the first coal dryer, and the third coal dryer 170 naturally drying
the coal dried by the second coal dryer and then, supplying the
dried coal to the dried coal reservoir 600.
[0066] In the first coal dryer 110, a pair of first drive sprockets
111 and a pair of first driven sprockets 112 are spaced apart from
each other at a predetermined distance to be fastened to first
chains 113, respectively, a plurality of transfer plates 114 is
hinge-coupled between the first chains 113, a pair of first guide
rails 115 horizontally supporting the first transfer plate 114 is
installed below an upper second chain 143 connected between the
first drive sprocket 111 and the first driven sprocket 112, a pair
of second guide rails 116 horizontally supporting the first
transfer plate 114 is installed below a lower first chain 113
connected between the first drive sprocket 111 and the first driven
sprocket 112, a first steam chamber 120 injecting reheat steam
supplied from a reheater 500 is installed below the upper first
chain 113, a second steam chamber 123 injecting reheat steam
supplied from the reheater 500 is installed below the lower first
chain 113, a first exhaust gas chamber 124 collecting exhaust gas
is installed on the upper first chain 113, and a second exhaust gas
chamber 126 collecting exhaust gas is installed on the lower first
chain 113.
[0067] In addition, in the second coal dryer 140, a pair of second
drive sprockets 141 and a pair of second driven sprockets 142 are
spaced apart from each other at a predetermined distance to be
fastened to second chains 143, respectively, a plurality of
transfer plates 144 is hinge-coupled between the second chains 143,
a pair of second guide rails 145 horizontally supporting the second
transfer plate 144 is installed below an upper second chain 143
connected between the second drive sprocket 141 and the second
driven sprocket 142, a pair of second guide rails 146 horizontally
supporting the second transfer plate 144 is installed below a lower
second chain 143 connected between the second drive sprocket 141
and the second driven sprocket 142, a third steam chamber 150
injecting reheat steam supplied from the reheater 500 is installed
below the upper second chain 143, a fourth steam chamber 153
injecting reheat steam supplied from the reheater 500 is installed
below the lower second chain 143, a third exhaust gas chamber 154
collecting exhaust gas is installed on the upper second chain 143,
and a fourth exhaust gas chamber 156 collecting exhaust gas is
installed on the lower second chain 143.
[0068] Therefore, in the present invention, the steam supply pipe
121 supplying hot reheat steam generated from the reheater 500 is
connected to one side of the first steam chamber 120 and the second
steam chamber 123, and the steam supply pipe 151 supplying hot
reheat steam generated from the reheater 500 is connected to one
side of the third steam chamber 150 and the fourth steam chamber
153. In addition, a perforated plate 10 for first steam
distribution through-formed with a plurality of first steam
injection holes 11 is installed on the inside of each of the first
steam chamber 120, the second steam chamber 123, the third steam
chamber 150, and the fourth steam chamber 153. In each of the first
steam chamber 120 to the fourth steam chamber 153, the reheat steam
having uniform pressure is injected through the first steam
injection holes 11.
[0069] In FIG. 3, the first steam chamber 120 is installed below
the first guide rail 115 and the second steam chamber 124 is
installed below the second guide rail 116. Moreover, the third
steam chamber 150 is installed below the third guide rail 145 and
the fourth steam chamber 153 is installed below the fourth guide
rail 146. One or more first steam chambers 120 to fourth steam
chambers 153 may be partitioned and installed.
[0070] Further, in FIG. 4, a first exhaust gas chamber 124 is
installed on the first guide rail 115, a second exhaust gas chamber
126 is installed on the second guide rail 116, a third gas chamber
154 is installed on the third guide rail 145, and a fourth gas
chamber 156 is installed on the fourth guide rail 146. One or more
first exhaust gas chambers 124 to fourth exhaust gas chambers 156
may be partitioned and installed. The first exhaust gas chamber 124
to the fourth exhaust gas chamber 156 collect exhaust gas injected
and thereafter, changed in the first steam chamber 120 to the
fourth steam chamber 156, respectively and thereafter, discharged
to the outside through the first gas discharge pipe 125 or the
second gas discharge pipe 155.
[0071] In the first transfer plate 114, a plurality of
through-holes 114a is formed so that the reheat steam injected from
the first steam chamber 120 and the second steam chamber 123 passes
through the first transfer plate 114 to contact coal particles. At
upper left and right sides of the first transfer plate 114, a guard
114b having a predetermined height is installed to prevent the
input coal pile from flowing in a left or right direction of the
first transfer plate 114. The guard 114b has a shape that is wide
at the top and narrow at the bottom as a substantially trapezoidal
shape. Accordingly, the top of the guard 114b of the first transfer
plate 114 is overlapped with an adjacent guard 114b. In this case,
the guard 114b of the first transfer plate 114 is installed in a
substantially zigzag direction with the adjacent guard 114b.
Further, at lower left and right sides of the first transfer plate
114, shield plates 114c are installed to prevent the reheat steam
injected from the first steam chamber 120 and the second steam
chamber 123 from being lost when injected to left and right sides
of each of the first steam chamber 120 and the second steam chamber
123.
[0072] In addition, in the second transfer plate 144, a plurality
of through-holes 144a is formed so that the reheat steam injected
from the third steam chamber 150 and the fourth steam chamber 153
passes through the second transfer plate 144 to contact coal
particles. At upper left and right sides of the second transfer
plate 144, guards 144b having a predetermined height are installed
to prevent the input coal pile from flowing in a left or right
direction of the second transfer plate 144. The guard 144b has a
shape that is narrow at the top and widened at the bottom as the
substantially trapezoidal shape. Accordingly, the top of the guard
144b of the second transfer plate 144 is overlapped with an
adjacent guard 144b. In this case, the guard 144b of the second
transfer plate 144 may be installed in the substantially zigzag
direction with the adjacent guard 144b. Further, at lower left and
right sides of the second transfer plate 144, shield plates 144c
are installed to prevent the reheat steam injected from the third
steam chamber 150 and the fourth steam chamber 153 from being lost
when injected to left and right sides of each of the third steam
chamber 150 and the fourth steam chamber 153.
[0073] A first embodiment of an apparatus for adjusting steam
pressure in the system for drying coal using reheat steam according
to the present invention will be described with reference to FIGS.
5 to 9.
[0074] In FIG. 5, the steam chamber 120 has a space part
accommodating the reheat steam therein. The steam supply pipe 121
supplying the high-temperature reheat steam generated by the
reheater 500 is connected to one side of the steam chamber 120. A
first steam distribution perforated plate 10 in which a plurality
of first steam injection holes 11 is formed to penetrate is coupled
to an inner upper part of the steam chamber 120. Moreover, the
first steam distribution perforated plate 10 in which the plurality
of first steam injection holes 11 is formed to penetrate is coupled
to the top of the steam chamber 120.
[0075] The steam chamber 120 is installed below the transfer plate
with the plurality of through-holes to inject the reheat steam at
uniform pressure through the first steam injection holes 11.
[0076] A perforation ratio of the first steam injection holes 11 to
an entire area of the first steam distribution perforated plate 10
may be approximately 10 to 15%.
[0077] In FIG. 6, a coal pile to be dried is transferred onto the
plurality of transfer plates 114 and 144 hinge-coupled to the
respective chains 113 and 143, the steam chambers 120, 123, 150,
and 153 are installed below the transfer plates 114 and 144, and
the high-temperature reheat steam is supplied to the steam chamber
through the steam supply pipes 121 and 151. In this case, the
reheat steam supplied to each steam chamber is filled in an inner
first space part 14 and thereafter, injected at uniform pressure
through the first steam injection holes 11 formed in the first
steam distribution perforated plate 10 formed at a predetermined
interval. Accordingly, the reheat steam injected through the first
steam injection holes 11 is applied to coal (C) particles through
the through-holes 114a and 144a formed on the transfer plates 114
and 144. Therefore, while the high-temperature reheat steam passes
through the porosity between the surface of the coal C and the
coal, the moisture contained in the coal C is evaporated. Moreover,
since the first steam injection holes 11 of the first steam
distribution perforated plate 10 are arranged constantly, the
reheat steam at uniform pressure is injected through the first
steam injection holes 11 and the reheat steam at uniform pressure
passes throughout the coal C on the transfer plates 114 and 144 to
enhance a drying effect.
[0078] Further, in FIG. 7, as another embodiment of the steam
chamber of the present invention, a second steam distribution
perforated plate 12 where a plurality of second steam injection
holes 13 is formed to penetrate is installed on the top of the
first steam distribution perforated plate 10 installed in the first
steam chamber 120 to the fourth steam chamber 153. The second steam
distribution perforated plate 12 may be installed on the top of the
first steam distribution perforated plate 10 and one or more second
steam distribution perforated plates 12 may be installed.
[0079] In FIG. 8, the high-temperature reheat steam supplied
through the steam supply pipes 121 and 151 is filled in the inner
first space part 14 of each of the first steam chamber 120 to the
fourth steam chamber 153 and thereafter, the reheat is injected to
a second space part 15 between the first steam distribution
perforated plate 10 and the second steam distribution perforated
plate 12 at uniform pressure through the first steam injection
holes 11 formed in the first steam distribution perforated plate 10
at a predetermined interval. Further, the reheat steam filled in
the second space part 15 is injected through the second steam
injection holes 13 formed in the second steam distribution
perforated plate 12. Accordingly, when the reheat steam is supplied
to the first space part 14 of each of the first steam chamber 120
to the fourth steam chamber 153 from each of the steam supply pipes
121 and 151, the pressure of the reheat steam is primarily
distributed by the first space part 14, and as a result, uniform
pressure is maintained. In addition, the reheat steam filled in the
first space part 14 is injected to the second space part 15 through
the first steam injection holes 11 of the first steam distribution
perforated plate 10 and thereafter, the pressure of the reheat
steam is secondarily distributed by the second space part 15 to
maintain uniform pressure.
[0080] Accordingly, the reheat steam filled the second space part
15 is injected to the coal (C) particles through the through-holes
114a and 144a formed on the transfer plates 114 and 144 through the
second steam injection holes 13. Therefore, while the
high-temperature reheat steam passes through the porosity between
the surface of the coal C and the coal, the moisture contained in
the coal C is evaporated. Moreover, since the second steam
injection holes 13 of the second steam distribution perforated
plate 12 are arranged constantly, the reheat steam at uniform
pressure is injected through the second steam injection holes 13
and the reheat steam at more uniform pressure passes throughout the
coal C on the transfer plates 114 and 144 to enhance the drying
effect.
[0081] Further, the perforation ratio of the second steam injection
holes 13 to the entire area of the second steam distribution
perforated plate 12 may be 10 to 15%.
[0082] Meanwhile, in FIG. 9, as yet another embodiment of the
present invention, a plurality of distribution steam supply pipes
20 is connected to one side of the steam chamber. That is, the
distribution steam supply pipe 20 is connected to one side of each
of the first steam chamber 120 to the fourth steam chamber 153, and
as a result, the reheat steam at uniform pressure is filled in each
first space part 14. Accordingly, the reheat steam at more uniform
pressure is supplied and filled into each of the first steam
chamber 120 to the fourth steam chamber 153 by the reheat steam
branched and supplied to the distribution steam supply pipe 20, and
as a result, the reheat steam at constant pressure is injected
throughout the coal on the transfer plate.
[0083] A second embodiment of an apparatus for adjusting steam
pressure in the system for drying coal using reheat steam according
to the present invention will be described with reference to FIGS.
10 to 13.
[0084] In FIG. 10, the steam chamber 120 has a space part
accommodating the reheat steam therein. The steam supply pipe 121
supplying the high-temperature reheat steam generated by the
reheater 500 is connected to one side of the steam chamber 120. The
first steam distribution perforated plate 10 in which the plurality
of first steam injection holes 11 is formed to penetrate is
installed in the inner upper part of the steam chamber 120.
Moreover, the first steam distribution perforated plate 10 in which
the plurality of first steam injection holes 11 is formed to
penetrate may be coupled to the top of the steam chamber 120.
[0085] The steam chamber 120 is installed below the transfer plate
with the plurality of through-holes to inject the reheat steam at
uniform pressure through the first steam injection holes 11.
[0086] In FIG. 11, a first support member 31 is fixed to a first
fixation member 35 provided on the bottom of the first steam
distribution perforated plate 10 installed inside the steam chamber
120 and a second support member 32 is fixed to a second fixation
member 36 provided on the bottom inside the steam chamber 120. A
plurality of elastic supports 30 to which an elastic body 33 having
elastic force having a predetermined magnitude is coupled is
installed between the first support member 31 and the second
support member 32. The first elastic support 30 is installed to
support the first steam distribution perforated plate 10 to form
the first space part 14 with the steam chamber 120 and the first
steam distribution perforated plate 10 is lifted with steam
pressure which flows in the first space part 14 to constantly
maintain reheat steam injection pressure through the first steam
injection holes 11.
[0087] In FIG. 12a, when steam pressure flows into the first space
part 14 of the steam chamber 120, the first steam distribution
perforated plate 10 maintains a predetermined interval with the
bottom surface of the steam chamber 120 by the elastic force of the
elastic body 33. However, when the steam pressure flows into the
first space part 14 of the steam chamber 120, while the first steam
distribution perforated plate 10 is lifted by the steam pressure,
uniform steam pressure is formed in the first space part 14.
Accordingly, the uniform steam pressure formed in the first space
part 14 is injected to the transfer plate through the first steam
injection holes 11. Further, when the steam pressure does not flow
into the steam chamber 120, the first steam distribution perforated
plate 10 returns to an original location by the elastic force of
the elastic body 33. As the elastic body 33, a tension spring is
preferably adopted, but a compression spring may be adopted. In
addition, a plurality of first elastic supports 30 are installed
between the bottom surface of the steam chamber 120 and the first
steam distribution perforated plate 10 at a predetermined interval,
and as a result, the first elastic supports 30 preferably has
elastic force to uniformly support the first steam distribution
perforated plate 10 from the bottom surface of the steam chamber
120. A pocket 30 is coupled to the outer periphery of the first
elastic support 30 to preferably prevent foreign materials from
being fixed to the elastic body outside.
[0088] Further, a first stopper 37 for horizontally supporting the
first steam distribution perforated plate 10 is installed on the
inner wall of the steam chamber 120 to protrude. The first stopper
37 is configured to horizontally support the edge of the first
steam distribution perforated plate 10 when the steam pressure is
not generated in the first space part 14.
[0089] Moreover, in FIG. 12b, the coal C to be dried is transferred
onto the plurality of transfer plates 114 and 144 hinge-coupled to
the respective chains 113 and 143, the steam chambers 120, 123,
150, and 153 are installed below the transfer plates 114 and 144,
and the high-temperature reheat steam is supplied to the steam
chamber through the steam supply pipes 121 and 151. The reheat
steam supplied to each steam chamber is filled in the first space
part 14 and thereafter, predetermined pressure is formed and the
first steam distribution perforated plate 10 is lifted by the
pressure. In this case, primary pressure of the reheat steam itself
which flows into the first space part 14 by the first steam
distribution perforated plate 10 and secondary pressure by the
first steam distribution perforated plate 10 are formed. The first
steam distribution perforated plate 10 is lifted up to a
predetermined height by elasticity of the plurality of first
elastic supports 30 coupled to the bottom surface of the steam
chamber. In addition, the reheat steam which maintains the
predetermined pressure in the first space part 14 is injected at
the uniform pressure through the first steam injection holes 11
formed in the first steam distribution perforated plate 10 formed
at a predetermined interval.
[0090] Accordingly, the reheat steam injected through the first
steam injection holes 11 is applied to each particle of the coal
(C) through the through-holes 114a and 144a formed on the transfer
plates 114 and 144. Therefore, while the high-temperature reheat
steam passes through the porosity between the surface of the coal
and the coal particles, the moisture contained in the coal particle
is evaporated. Moreover, since the first steam injection holes 11
of the first steam distribution perforated plate 10 are arranged
constantly, the reheat steam at uniform pressure is injected
through the first steam injection holes 11 and the reheat steam at
uniform pressure passes throughout the coal C on the transfer
plates 114 and 144 to enhance the drying effect. Further, the
plurality of elastic supports 30 elastically supports the first
steam distribution perforated plate 10 to inject the steam pressure
at more uniform steam pressure.
[0091] Further, in FIG. 13, as another embodiment of the steam
chamber of the present invention, the second steam distribution
perforated plate 12 where a plurality of second steam injection
holes 13 is formed to penetrate is installed on the top of the
first steam distribution perforated plate 10 installed in the first
steam chamber 120 to the fourth steam chamber 153.
[0092] In addition, a first support member 42 is fixed to a third
fixation member 46 provided on the bottom of the second steam
distribution perforated plate 10 and a second support member 42 is
fixed to a fourth fixation member 46 provided on the surface of the
first steam distribution perforated plate 10. A plurality of second
elastic supports 40 to which an elastic body 43 having elastic
force having a predetermined magnitude is coupled is installed
between the first support member 41 and the second support member
42. A plurality of second elastic supports 40 is installed to
support the second steam distribution perforated plate 12. In
addition, the second space part 15 is formed between the second
steam distribution perforated plate 12 and the first steam
distribution perforated plate 10. While the second steam
distribution perforated plate 12 is lifted by the steam pressure
which flows into the second space part 15, the injection pressure
of the reheat steam is constantly maintained through the second
steam injection holes 13. A pocket 44 is coupled to the outer
periphery of the second elastic support 40 to preferably prevent
the foreign materials from being fixed to the outside.
[0093] Further, the first stopper 37 for horizontally supporting
the first steam distribution perforated plate 10 is installed on
the inner wall of the steam chamber 120 to protrude and a second
stopper 47 for horizontally supporting the second steam
distribution perforated plate 12 is installed to protrude. When the
steam pressure is not generated in the first space part 14, the
first stopper 37 may horizontally support the edge of the first
steam distribution perforated plate 10 and when the steam pressure
is not generated in the second space part 15, the second stopper 47
may horizontally support the edge of the second steam distribution
perforated plate 12.
[0094] Accordingly, the coal C to be dried is transferred onto the
plurality of transfer plates 114 and 144 hinge-coupled to the
respective chains 113 and 143, the steam chambers 120, 123, 150,
and 153 are installed below the transfer plates 114 and 144, and
the high-temperature reheat steam is supplied to the steam chamber
through the steam supply pipes 121 and 151. The reheat steam
supplied to each steam chamber is filled in the first space part 14
and thereafter, predetermined pressure is formed and the first
steam distribution perforated plate 10 is lifted by the pressure.
In this case, primary pressure of the reheat steam itself which
flows into the first space part 14 by the first steam distribution
perforated plate 10 and secondary pressure by the first steam
distribution perforated plate 10 are formed. The first steam
distribution perforated plate 10 is lifted up to a predetermined
height by elasticity of the plurality of first elastic supports 30
coupled to the bottom surface of the steam chamber. In addition,
the reheat steam which maintains the predetermined pressure in the
first space part 14 is injected at the uniform pressure through the
first steam injection holes 11 formed in the first steam
distribution perforated plate 10 formed at a predetermined
interval.
[0095] Further, the reheat steam injected through the first steam
injection holes 11 of the first steam distribution perforated plate
10 and thereafter, predetermined pressure is formed to lift the
second steam distribution perforated plate 12 by the pressure. In
this case, the primary pressure of the reheat steam itself which
flows into the second space part 15 by the first steam distribution
perforated plate 12 and the secondary pressure by the second steam
distribution perforated plate 12 are formed. The second steam
distribution perforated plate 10 is lifted up to a predetermined
height by the elasticity of the plurality of second elastic
supports 40 coupled to the surface of the first steam distribution
perforated plate 10. In addition, the reheat steam which maintains
the predetermined pressure in the second space part 15 is injected
at the uniform pressure through the second steam injection holes 13
formed in the second steam distribution perforated plate 12 formed
at a predetermined interval.
[0096] Accordingly, the reheat steam injected through the second
steam injection holes 13 is applied to each particle of the coal
(C) through the through-holes 114a and 144a formed on the transfer
plates 114 and 144. Therefore, while the high-temperature reheat
steam passes through the porosity between the surface of the coal
and the coal particles, the moisture contained in the coal particle
is evaporated. Moreover, since the second steam injection holes 13
of the second steam distribution perforated plate 12 are arranged
constantly, the reheat steam at uniform pressure is injected
through the second steam injection holes 13 and the reheat steam at
uniform pressure passes throughout the coal C on the transfer
plates 114 and 144 to enhance the drying effect. Further, the
plurality of second elastic supports 40 elastically supports the
second steam distribution perforated plate 12 to inject the steam
pressure at more uniform steam pressure. The reheat steam at more
constant pressure may pass throughout the coal C on the transfer
plates 114 and 144 with the steam pressure uniformly distributed by
the first steam distribution perforated plate 10 elastically
supported by the first elastic support 30 installed in the first
space part 14 of the steam chamber and the reheat steam pressure
more uniformly distributed and injected by the second steam
distribution perforated plate 12 elastically supported by the
second elastic support 40 installed in the second space part 15 of
the steam chamber to more effectively and rapidly dry the coal
C.
[0097] A third embodiment of an apparatus for adjusting steam
pressure in the system for drying coal using reheat steam according
to the present invention will be described with reference to FIGS.
14 to 20.
[0098] In FIGS. 14 and 15, the guards 114b and 144b are integrally
coupled to left and right tops of the transfer plates 114 and 144,
shield plates 114c and 144c are integrally coupled to left and
right bottoms of the transfer plates 114 and 144, and one side of
the first steam pressure adjuster 50 having the elasticity is
fixedly installed on each of both side walls of the steam chamber
120 installed below the transfer plates 114 and 144 by the fixation
member 51. The first steam pressure adjuster 50 is a leaf spring
having an approximately flat plate shape.
[0099] Meanwhile, when the steam pressure injected into the
transfer plates 114 and 144 from the steam chamber 120 is equal to
or more than predetermined pressure, coal having small particles
loaded and transferred on the transfer plates 114 and 144 is
scattered to generate dust, and as a result, the steam pressure
injected to the transfer plates 114 and 144 from the steam chamber
120 needs to be adjusted.
[0100] Accordingly, in FIG. 16a, when the steam pressure of the
reheat steam transferred from the steam chamber 120 is equal to or
more tan the predetermined pressure while the surface of the first
steam pressure adjuster 50 contact the bottoms of the shield plates
114c and 144c, the steam pressure presses the first steam pressure
adjuster 50 having the elasticity to discharge the reheat steam
between the first steam pressure adjuster 50 and the shield plates
114c and 144c, thereby adjusting the steam pressure at
predetermined pressure or more.
[0101] In FIG. 16b, the coal C to be dried is transferred onto the
plurality of transfer plates 114 and 144 hinge-coupled to the
respective chains 113 and 143, the steam chambers 120, 123, 150,
and 153 are installed below the transfer plates 114 and 144, and
the high-temperature reheat steam is supplied to the steam chamber
through the steam supply pipes 121 and 151. The reheat steam
supplied to each steam chamber is filled in the first space part 14
and thereafter, predetermined pressure is formed and the steam
distribution perforated plate 10 is lifted by the pressure. In this
case, the primary pressure of the reheat steam itself which flows
into the first space part 14 by the steam distribution perforated
plate 10 and the secondary pressure by the steam distribution
perforated plate 10 are formed.
[0102] Accordingly, the reheat steam injected through the steam
injection holes 11 is applied to each particle of the coal (C)
through the through-holes 114a and 144a formed on the transfer
plates 114 and 144. Therefore, while the high-temperature reheat
steam passes through the porosity between the surface of the coal
and the coal particles, the moisture contained in the coal particle
is evaporated. Moreover, since the steam injection holes 11 of the
steam distribution perforated plate 10 are arranged constantly, the
reheat steam at uniform pressure is injected through the steam
injection holes 11 and the reheat steam at uniform pressure passes
throughout the coal C on the transfer plates 114 and 144 to enhance
the drying effect. In this case, when the reheat steam at
predetermined pressure is injected from the steam chamber 120, the
steam pressure increases between the transfer plates 114 and 144
and the steam distribution perforated plate 10 of the steam chamber
120 and the steam pressure is dispersed to the left and right sides
of the steam chamber 120. The first steam pressure adjuster 50
fixedly to the side wall of the steam chamber 120 and contacting
the shield plates 114c and 144c is pushed down by the steam
pressure dispersed by the steam chamber 120 to generate a gap
interval with the shield plates 114c and 144c. Since the reheat
steam is discharged through the gap interval generated between the
first steam pressure adjuster 50 and the shield plates 114c and
144c by the steam pressure, the steam pressure between the transfer
plates 114 and 144 and the steam chamber 120 decreases, and as a
result, the pressure of the reheat steam injected to the transfer
plates 114 and 144 also decreases. Further, when the steam pressure
between the transfer plates 114 and 144 and the steam chamber 120
decreases, the first steam pressure adjuster 50 returns to the
bottoms of the shield plates 114c and 144c by the elasticity to
interrupt the discharged reheat steam. The first steam pressure
adjuster 50 has a characteristic such as an approximately leaf
spring and as the elastic force of the first steam pressure
adjuster 50, it is adopted that a balance of mutual forces of the
steam pressures formed between the transfer plates 114 and 144 and
the steam chamber 120 is appropriately formed. That is, when the
steam pressure formed between the transfer plates 114 and 144 and
the steam chamber 120 is equal to or more than set steam pressure,
that is, steam pressure at which the coal particles are scattered
to generate the dust, the elastic force to separate the first steam
pressure adjuster 50 from the shield plates 114c and 144c is
preferably provided to the first steam pressure adjuster 50.
[0103] Further, in FIG. 17, as another example of the present
invention, in the apparatus for adjusting steam pressure of the
reheat steam supply chamber, the guards 114b and 144b are
integrally coupled to the left and right tops of the transfer
plates 114 and 144, the shield plates 114c and 144c are integrally
coupled to the left and right bottoms of the transfer plates 114
and 144, and one side of the second steam pressure adjuster 60
having the elasticity is fixedly installed on each of both side
walls of the steam chamber 120 installed below the transfer plates
114 and 144 by the fixation member 61. The second steam pressure
adjuster 60 has the elasticity in a substantially U shape.
[0104] Accordingly, in FIG. 18a, when the steam pressure of the
reheat steam transferred from the steam chamber 120 is equal to or
more tan the predetermined pressure while the inner surface of the
second steam pressure adjuster 60 contact the bottoms of the shield
plates 114c and 144c, the steam pressure presses the second steam
pressure adjuster 60 having the elasticity to discharge the reheat
steam between the second steam pressure adjuster 60 and the shield
plates 114c and 144c, thereby adjusting the steam pressure at
predetermined pressure or more.
[0105] In FIG. 18b, when the reheat steam at predetermined pressure
is injected from the steam chamber 120, the steam pressure
increases between the transfer plates 114 and 144 and the steam
distribution perforated plate 10 of the steam chamber 120 and the
steam pressure is dispersed to the left and right sides of the
steam chamber 120. The second steam pressure adjuster 60 fixedly to
the side wall of the steam chamber 120 and contacting the shield
plates 114c and 144c is pushed down by the steam pressure dispersed
by the steam chamber 120 to generate the gap interval with the
shield plates 114c and 144c. Since the reheat steam is discharged
through the gap interval generated between the second steam
pressure adjuster 60 and the shield plates 114c and 144c by the
steam pressure, the steam pressure between the transfer plates 114
and 144 and the steam chamber 120 decreases, and as a result, the
pressure of the reheat steam injected to the transfer plates 114
and 144 also decreases. Further, when the steam pressure between
the transfer plates 114 and 144 and the steam chamber 120
decreases, the second steam pressure adjuster 60 returns to the
bottoms of the shield plates 114c and 144c by the elasticity to
interrupt the discharged reheat steam. The second steam pressure
adjuster 60 has the U shape having the elasticity and as the
elastic force of the second steam pressure adjuster 60, it is
adopted that the balance of the mutual forces of the steam
pressures formed between the transfer plates 114 and 144 and the
steam chamber 120 is preferably appropriately formed. That is, when
the steam pressure formed between the transfer plates 114 and 144
and the steam chamber 120 is equal to or more than the set steam
pressure, that is, the steam pressure at which the coal particles
are scattered to generate the dust, the elastic force to separate
the second steam pressure adjuster 60 from the shield plates 114c
and 144c is preferably provided to the second steam pressure
adjuster 60.
[0106] Further, in FIG. 19, as another example of the present
invention, in the apparatus for adjusting steam pressure of the
reheat steam supply chamber, the guards 114b and 144b are
integrally coupled to the left and right tops of the transfer
plates 114 and 144, the shield plates 114c and 144c are integrally
coupled to the left and right bottoms of the transfer plates 114
and 144, and one side of a third steam pressure adjuster 70 having
the elasticity is fixedly installed on each of both side walls of
the steam chamber 120 installed below the transfer plates 114 and
144.
[0107] The third steam pressure adjuster 70 has the elasticity in a
substantially "L" shape. Moreover, in the third steam pressure
adjuster 70, a fixation plate 71 and an operation plate 72 are
coupled to each other by a hinge 73. One side of the fixation plate
71 is fixed onto the side wall of the steam chamber 120 and the
other side of the fixation plate 71 is coupled with the hinge 73.
The fixation plate 71 has a substantially flat plate shape. The
bottoms of the shield plates 114c and 144c contact the surface of
the operation plate 72 in the substantially "" shape. One side of
the operation plate 72 is coupled to the hinge 73. Moreover, the
fixation plate 71 and the operation plate 72 coupled to the hinge
73 are elastically supported by a spring.
[0108] Accordingly, in FIG. 20a, when the steam pressure of the
reheat steam transferred from the steam chamber 120 is equal to or
more tan the predetermined pressure while the surface of the
operation plate 72 of the third steam pressure adjuster 70 contact
the bottoms of the shield plates 114c and 144c, the steam pressure
presses the third steam pressure adjuster 70 to discharge the
reheat steam between the third steam pressure adjuster 70 and the
shield plates 114c and 144c, thereby adjusting the steam pressure
at predetermined pressure or more.
[0109] In FIG. 20b, when the reheat steam at predetermined pressure
is injected from the steam chamber 120, the steam pressure
increases between the transfer plates 114 and 144 and the steam
distribution perforated plate 10 of the steam chamber 120 and the
steam pressure is dispersed to the left and right sides of the
steam chamber 120. In the third steam pressure adjuster 70 in which
the operation plate 72 is fixed to the side wall of the steam
chamber 120 and the operation plate 72 coupled with the fixation
plate 71 through the hinge 73 contacts the shield plates 114c and
144c, the operation plate 72 is pushed down by the steam pressure
dispersed by the steam chamber 120 to generate the gap interval
with the shield plates 114c and 144c. Since the reheat steam is
discharged through the gap interval generated between the operation
plate 72 of the third steam pressure adjuster 70 and the shield
plates 114c and 144c by the steam pressure, the steam pressure
between the transfer plates 114 and 144 and the steam chamber 120
decreases, and as a result, the pressure of the reheat steam
injected to the transfer plates 114 and 144 also decreases.
Further, when the steam pressure between the transfer plates 114
and 144 and the steam chamber 120 decreases, the operation plate 72
of the third steam pressure adjuster 70 returns to the bottoms of
the shield plates 114c and 144c by the elasticity to interrupt the
discharged reheat steam. The operation plate 72 of the third steam
pressure adjuster 70 has the "" shape having the elasticity and as
the elastic force of a spring 74 coupled between the operation
plate 72 of the third steam pressure adjuster 70 and the fixation
plate 71, it is adopted that the balance of the mutual forces of
the steam pressures formed between the transfer plates 114 and 144
and the steam chamber 120 is preferably appropriately formed. That
is, when the steam pressure formed between the transfer plates 114
and 144 and the steam chamber 120 is equal to or more than the set
steam pressure, that is, the steam pressure at which the coal
particles are scattered to generate the dust, the elastic force to
separate the spring 74 coupled with the operation plate 72 of the
third steam pressure adjuster 70 from the shield plates 114c and
144c is preferably provided to the spring 74.
[0110] A fourth embodiment of an apparatus for adjusting steam
pressure in the system for drying coal using reheat steam according
to the present invention will be described with reference to FIGS.
21 to 25.
[0111] In FIGS. 21 and 22, the guards 114b and 144b are integrally
coupled to the left and right tops of the transfer plates 114 and
144, the shield plates 114c and 144c are integrally coupled to the
left and right bottoms of the transfer plates 114 and 144, and one
side of a steam pressure adjuster 80 having the elasticity is
fixedly installed on each of both plates of the steam chamber 120
installed below the transfer plates 114 and 144 by the fixation
member 51.
[0112] Moreover, in the steam pressure adjuster 80, a guide plate
81 is installed on each of both side walls of the steam chamber 120
installed below the transfer plates 114 and 144. A long hole 82 is
formed at the center of the guide plate 81 in the longitudinal
direction, that is, in a direction parallel to the side wall of the
steam chamber 120. A plurality of through-holes 83 are formed at
both sides of the long hole 82 at a predetermined interval. The
guide plate 81 having the substantially flat plate shape may be
fixed to both side walls of the steam chamber 120 and fixed by
using the fixation member.
[0113] An operation member 84 is installed above the guide plate
81. The operation member 84 is installed to contact the bottoms of
the shield plates 114c and 144c above the guide plate 81. The
operation member 84 has a substantially " E " shape and the shield
plates 114c and 144c contact the inner bottom surface at a groove
portion.
[0114] An elevation plate 85 has a plate shape which is formed to
protrude downward on the bottom of the operation member 84. The
elevation plate 85 is elevated while being inserted into the long
hole 82 formed on the guide plate 81. A plurality of guide rods 86
are coupled to both sides of the elevation plate 85. The guide rods
86 having a rod shape which is formed to protrude downward on the
bottom of the operation member 84 are elevated while being inserted
into the through-holes 83 formed on the guide plate 81,
respectively. In addition, the guide rods 86 are elastically
supported by a spring 87 between the bottom of the operation member
84 and the surface of the guide plate 81.
[0115] Meanwhile, when the steam pressure injected into the
transfer plates 114 and 144 from the steam chamber 120 is equal to
or more than predetermined pressure, coal having small particles
loaded and transferred on the transfer plates 114 and 144 is
scattered to generate dust, and as a result, the steam pressure
injected to the transfer plates 114 and 144 from the steam chamber
120 needs to be adjusted.
[0116] Accordingly, in FIG. 23a, when the steam pressure of the
reheat steam transferred from the steam chamber 120 is equal to or
more tan the predetermined pressure while the inner surface of the
operation member 84 of the steam pressure adjuster 80 contacts the
shield plates 114c and 144c, the steam pressure presses the spring
87 elastically supported on the guide rod 86 on the bottom of the
operation member 84 to discharge the reheat steam between the
operation member 84 of the steam pressure adjuster 80 and the
shield plates 114c and 144c, thereby adjusting the steam pressure
at predetermined pressure or more.
[0117] In FIG. 23b, the coal C to be dried is transferred onto the
plurality of transfer plates 114 and 144 hinge-coupled to the
respective chains 113 and 143, the steam chambers 120, 123, 150,
and 153 are installed below the transfer plates 114 and 144, and
the high-temperature reheat steam is supplied to the steam chamber
through the steam supply pipes 121 and 151. The reheat steam
supplied to each steam chamber is filled in the first space part 14
and thereafter, predetermined pressure is formed and the steam
distribution perforated plate 10 is lifted by the pressure. In this
case, the primary pressure of the reheat steam itself which flows
into the first space part 14 by the steam distribution perforated
plate 10 and the secondary pressure by the steam distribution
perforated plate 10 are formed.
[0118] Accordingly, the reheat steam injected through the steam
injection holes 11 is applied to each particle of the coal (C)
through the through-holes 114a and 144a formed on the transfer
plates 114 and 144. Therefore, while the high-temperature reheat
steam passes through the porosity between the surface of the coal
and the coal particles, the moisture contained in the coal particle
is evaporated. Moreover, since the steam injection holes 11 of the
steam distribution perforated plate 10 are arranged constantly, the
reheat steam at uniform pressure is injected through the steam
injection holes 11 and the reheat steam at uniform pressure passes
throughout the coal C on the transfer plates 114 and 144 to enhance
the drying effect.
[0119] In this case, when the reheat steam at predetermined
pressure is injected from the steam chamber 120, the steam pressure
increases between the transfer plates 114 and 144 and the steam
distribution perforated plate 10 of the steam chamber 120 and the
steam pressure is dispersed to the left and right sides of the
steam chamber 120. The dispersed steam pressure presses the
operation member 84 contacting the shield plates 114c and 144c and
the operation member 84 pushes down the elevation plate 85 and the
guide rod 86 inserted into the long hole 82 and the plurality of
through-holes 83 formed on the guide plate 81, respectively. In
this case, a gap is formed while the operation member 84 contacting
the shield plates 114c and 144c moves down and the steam pressure
of the steam chamber 120 is discharged through the gap. In
addition, the elevation plate 85 has a function to interrupt the
steam pressure generated by the steam chamber 120 from being
discharged without permission.
[0120] Since the reheat steam is discharged through the gap
interval generated between the operation member 84 of the steam
pressure adjuster 84 and the shield plates 114c and 144c by the
steam pressure of the steam chamber 120, the steam pressure between
the transfer plates 114 and 144 and the steam chamber 120
decreases, and as a result, the pressure of the reheat steam
injected to the transfer plates 114 and 144 also decreases.
Further, when the steam pressure between the transfer plates 114
and 144 and the steam chamber 120 decreases up to the predetermined
pressure or less, the operation plate 84 of the steam pressure
adjuster 80 is lifted by the elastic force of the spring 87
elastically supported on the guide rod 86 and the gap is clogged
between the shield plates 114c and 144c and the operation member 84
to prevent the reheat steam from being discharged.
[0121] As the elastic force of the spring 87 on the outer periphery
of the guide rod 86 between the operation member 84 of the steam
pressure adjuster 80 and the guide plate 81, it is adopted that the
balance of the mutual forces of the steam pressures formed between
the transfer plates 114 and 144 and the steam chamber 120 is
appropriately formed. That is, when the steam pressure formed
between the transfer plates 114 and 144 and the steam chamber 120
is equal to or more than the set steam pressure, that is, the steam
pressure at which the coal particles are scattered to generate the
dust, the elastic force to separate the operation member 84 from
the shield plates 114c and 144c is preferably provided to the
operation member 84 elastically supported by the spring 87 mounted
on the outer periphery of the guide rod 86 of the steam pressure
adjuster 80.
[0122] Further, as another example of the present invention, in
FIG. 24, one surface of the operation member 84 is installed to
contact the side wall of the steam chamber 120.
[0123] In this case, the total steam pressure of the reheat steam
formed between the steam chamber 120 and the transfer plates 114
and 144 is transferred to the operation member 84 to more
effectively adjust the steam pressure. Moreover, the operation
member 84 operates more sensitively to the steam pressure to
discharge or interrupt the steam pressure between the shield plates
114c and 144c and the operation member 84.
[0124] Further, as yet another example of the present invention, in
FIG. 25, an interruption protrusion 88 is installed to protrude in
a horizontal direction outside the side wall of the steam chamber
120 and the side of the operation member 84 is installed to contact
the interruption protrusion 88.
[0125] In this case, the total steam pressure of the reheat steam
formed between the steam chamber 120 and the transfer plates 114
and 144 is transferred to the operation member 84 to more
effectively adjust the steam pressure. Moreover, the operation
member 84 operates more sensitively to the steam pressure to
discharge or interrupt the steam pressure between the shield plates
114c and 144c and the operation member 84. In addition, since the
side of the operation member 84 contacts the interruption
protrusion 88, the steam pressure of the steam chamber 120 is not
almost lost, but is applied to the operation member 84 to prevent
the coal particles transferred on the surface of the transfer plate
from being scattered without permission by adjusting the steam
pressure.
[0126] A fifth embodiment of an apparatus for adjusting steam
pressure in the system for drying coal using reheat steam according
to the present invention will be described with reference to FIGS.
26 to 30.
[0127] Meanwhile, in FIGS. 28 and 29a, a first injection cap 1070
is a cylindrical shape which is coupled to the through-hole 114a
formed to penetrate on the first transfer plate 114 to protrude.
One or more first injection holes 1071 are formed on the top of the
first injection cap 1070 to penetrate and a plurality of second
injection holes 1072 is formed on a cylindrical outer peripheral
side of the first injection cap 1070 to penetrate. Moreover, the
first transfer plate 114 to which the first injection cap 1070 is
coupled is hinge-coupled to the first chain 113 connected between
the first drive sprocket 111 and the first driven sprocket 112 of
the first coal dryer 110. The first injection cap 1070 disperses
and injects the reheat steam injected from the first steam chamber
120 below the transfer plate 114, that is, the upper first transfer
plate 114 through a first injection hole 1071 and a second
injection hole 1072 and disperses and injects the reheat steam
injected from the second steam chamber 123 below the lower first
transfer plate 114 through the first injection hole 1071 and the
second injection hole 1072. The reheat steam is injected to the
coal pile load and transferred on the surface of the transfer plate
114 with a predetermined thickness by penetrating from the bottom
to the top through the first injection hole 1071 and injected to
the inside of the side of the coal pile through the second
injection hole 1072 to maximize coal drying efficiency.
[0128] Further, a second injection cap 1080 is a cylindrical shape
which is coupled to the through-hole 144a formed to penetrate on
the second transfer plate 144 to protrude. One or more first
injection holes 1081 are formed on the top of the second injection
cap 1080 to penetrate and a plurality of second injection holes
1082 is formed on the cylindrical outer peripheral side of the
second injection cap 1080 to penetrate. Moreover, the second
transfer plate 144 to which the second injection cap 1080 is
coupled is hinge-coupled to the second chain 143 connected between
the second drive sprocket 141 and the first driven sprocket 142 of
the second coal dryer 140. The second injection cap 1080 disperses
and injects the reheat steam injected from the third steam chamber
150 below the transfer plate 144, that is, the upper first transfer
plate 144 through the first injection hole 1081 and the second
injection hole 1082 and disperses and injects the reheat steam
injected from the fourth steam chamber 153 below the lower second
transfer plate 154 through the first injection hole 1081 and the
second injection hole 1082. The reheat steam is injected to the
coal pile load and transferred on the surface of the transfer plate
144 with a predetermined thickness by penetrating from the bottom
to the top through the first injection hole 1081 and injected to
the inside of the side of the coal pile through the second
injection hole 1082 to maximize the coal drying efficiency.
[0129] In FIG. 29b, the height of the first injection cap 1070
formed on the first transfer plate 114 to protrude needs to be
formed to be lower than the bottom of a first flattener 30 and is
preferably formed to be lower than the loaded coal. Accordingly,
the reheat steam injected from the first steam chamber 120 is
dispersed and injected to the coal pile loaded and transferred onto
the upper first transfer plate 114 in each of the first injection
hole 1071 and the second injection hole 1072 of the first injection
cap 1070. Therefore, the coal pile loaded and transferred onto the
upper first transfer plate 114 is subjected to a drying process by
the reheat steam injected from the top and the side from the first
injection cap 1070 to enhance the drying efficiency to the inside
of the coal pile C.
[0130] In addition, the coal pile which is subjected to the drying
process by the reheat steam injected from the first injection cap
1070 of the upper first transfer plate 114 and thereafter, loaded
on the upper first transfer plate 114 is dropped onto the surface
of the lower first transfer plate 114. The reheat steam injected
from the second steam chamber 123 is dispersed and injected to the
coal pile loaded and transferred onto the lower first transfer
plate 114 in each of the first injection hole 1071 and the second
injection hole 1072 of the first injection cap 1070. The coal pile
loaded on the lower first transfer plate 114 is subjected to the
drying process by the reheat steam injected from the top and the
side from the first injection cap 1070 while being transferred to
enhance the drying efficiency to the inside of the coal pile C.
[0131] The height of the second injection cap 1080 formed on the
second transfer plate 144 to protrude needs to be formed to be
lower than the bottom of a third flattener 30 and is preferably
formed to be lower than the loaded coal. Accordingly, the reheat
steam injected from the third steam chamber 150 is dispersed and
injected to the coal pile loaded and transferred onto the upper
second transfer plate 144 in each of the first injection hole 1081
and the second injection hole 1082 of the second injection cap
1080. Therefore, the coal pile loaded and transferred onto the
upper second transfer plate 144 is subjected to the drying process
by the reheat steam injected from the top and the side from the
second injection cap 1080 to enhance the drying efficiency to the
inside of the coal pile C.
[0132] The reheat steam injected from the fourth steam chamber 153
is dispersed and injected to the coal pile loaded and transferred
onto the lower second transfer plate 144 in each of the first
injection hole 1081 and the second injection hole 1082 of the
second injection cap 1080. The coal pile loaded on the lower second
transfer plate 144 is subjected to the drying process by the reheat
steam injected from the top and the side from the second injection
cap 1080 while being transferred to enhance the drying efficiency
to the inside of the coal pile C.
[0133] Meanwhile, in FIG. 30, as another example of the first
injection cap 1070 and the second injection cap 1080, substantially
semi-spherical pressure maintaining members are connected to and
installed in a plurality of support pieces 1074, respectively in
the injection cap. After the reheat steam injected from the
corresponding steam chamber maintains predetermined pressure by the
corresponding pressure maintaining members 1073 and 1083, the
reheat steam is injected to the second injection holes 1072 and
1082 and the reheat steam discharged between the respective support
pieces 1074 and 1084 are injected to the first injection holes 1071
and 1084, respectively again. Accordingly, the pressure maintaining
member installed in each injection cap allows the reheat steam to
be injected to the side at predetermined pressure to enhance the
drying effect to the side of the coal pile.
[0134] Meanwhile, a sixth embodiment of an apparatus for adjusting
steam pressure in the system for drying coal using reheat steam
according to the present invention will be described with reference
to FIGS. 31 to 35. The sixth embodiment includes a configuration
and a structure that drops and supplies the coal pile transferred
on the transfer plate to the transfer plate of the lower dryer in
the multi-stage dryer in addition to the configuration and the
structure of the transfer plate.
[0135] In FIGS. 31 and 32, the first exhaust gas chamber 124 is
installed on the first guide rail 115, the second exhaust gas
chamber 126 is installed on the second guide rail 116, the third
gas chamber 154 is installed on the third guide rail 145, and the
fourth gas chamber 156 is installed on the fourth guide rail 146.
One or more first exhaust gas chambers 124 to fourth exhaust gas
chambers 156 may be partitioned and installed. The first exhaust
gas chamber 124 to the fourth exhaust gas chamber 156 collect
exhaust gas injected and thereafter, changed in the first steam
chamber 120 to the fourth steam chamber 156, respectively and
thereafter, discharged to the outside through the first gas
discharge pipe 125 or the second gas discharge pipe 155.
[0136] Moreover, the first steam chamber 120 is installed below the
first guide rail 115 and the second steam chamber 124 is installed
below the second guide rail 116. Moreover, the third steam chamber
150 is installed below the third guide rail 145 and the fourth
steam chamber 153 is installed below the fourth guide rail 146. One
or more first steam chambers 120 to fourth steam chambers 153 may
be partitioned and installed.
[0137] In FIG. 33, first transfer rollers 133 are hinge-coupled
between two-side centers of the first transfer plate 114 and the
second chains 113, respectively. That is, the first transfer roller
133 is hinge-coupled between the lateral center of the first
transfer plate 114 and the first chain 113. In addition, at left
and right sides of the first transfer roller 133, first auxiliary
rollers 134 are hinge-coupled with the sides of the first transfer
plate 114, respectively. The first auxiliary rollers 134 are
hinge-coupled with the sides of the second transfer plate 114, that
is, the left side and the right side, respectively.
[0138] Moreover, a groove 115a and a groove 116a guiding rotation
of the first transfer roller 133 and the first auxiliary roller 134
are formed on the surfaces of the first guide rail 115 and the
second guide rail 116, respectively. Accordingly, the first
transfer roller 133 and the first auxiliary roller 134
hinge-coupled with the first transfer plate 114 are transferred
along the groove 115a formed on the surface of the first guide rail
115 and the groove 116a formed on the surface of the second guide
rail 116.
[0139] Meanwhile, in FIGS. 34 and 35, a first guide bar 117
rotating and up-supporting the lower first transfer plate 114
separated from the second guide rail 116 in one direction is
installed from the top to the bottom of the first drive sprocket
111 along the side. A first trigger 117a is coupled to the end of
the first guide bar 117 and the first trigger 117a is constituted
by an axial rotating roller. The first trigger 117a is installed at
a position which is in contact with one side of the bottom of the
upper second transfer plate 114.
[0140] Further, a second guide bar 119 rotating and down-supporting
the upper first transfer plate 114 separated from the first guide
rail 114 is installed from the bottom to the top of the first
driven sprocket 112 along the side. A second trigger 119a is
coupled to the end of the second guide bar 119 and the second
trigger 119a is constituted by the axial rotating roller. The
second trigger 119a is installed at a position which is in contact
with one side of a plane of the lower first transfer plate 114.
[0141] In addition, in the second coal dryer 140, a pair of second
drive sprockets 141 and a pair of second driven sprockets 142 are
spaced apart from each other at a predetermined distance to be
fastened to second chains 143, respectively, a plurality of
transfer plates 144 is hinge-coupled between the second chains 143,
a pair of second guide rails 145 horizontally supporting the second
transfer plate 144 is installed below an upper second chain 143a
connected between the second drive sprocket 141 and the second
driven sprocket 142, a pair of second guide rails 146 horizontally
supporting the second transfer plate 144 is installed below a lower
second chain 143b connected between the second drive sprocket 141
and the second driven sprocket 143, a third steam chamber 150
injecting reheat steam supplied from the reheater 500 is installed
below the upper second chain 143a, a fourth steam chamber 153
injecting reheat steam supplied from the reheater 500 is installed
below the lower second chain 143b, a third exhaust gas chamber 154
collecting exhaust gas is installed on the upper second chain 143a,
and a fourth exhaust gas chamber 156 collecting exhaust gas is
installed on the lower second chain 143b.
[0142] Further, in FIG. 33, the first transfer rollers 135 are
hinge-coupled between both centers of the second transfer plate 144
and the second chains 113, respectively. That is, the second
transfer roller 135 is hinge-coupled between the lateral center of
the second transfer plate 144 and the second chain 143. In
addition, at left and right sides of the second transfer roller
135, second auxiliary rollers 136 are hinge-coupled with the sides
of the second transfer plate 144, respectively. The second
auxiliary rollers 136 are hinge-coupled with the sides, that is,
the left side and the right side of the second transfer plate
144.
[0143] Further, a groove 145a and a groove 146a guiding rotation of
the second transfer roller 135 and the second auxiliary roller 136
are formed on the surfaces of the third guide rail 145 and the
fourth guide rail 146, respectively. Accordingly, in the second
transfer plate 144, the second transfer roller 135 and the second
auxiliary roller 136 hinge-coupled with each other are transferred
along the groove 145a formed on the surface of the third guide rail
145 and the groove 146a formed on the surface of the fourth guide
rail 146.
[0144] Meanwhile, in FIGS. 34 and 35, a third guide bar 157
rotating and up-supporting the lower second transfer plate 144
separated from the fourth guide rail 146 in one direction is
installed from the top to the bottom of the second drive sprocket
141 along the side. A third trigger 157a is coupled to the end of
the third guide bar 157 and the third trigger 157a is constituted
by the axial rotating roller. The third trigger 157a is installed
at a position which is in contact with one side of the bottom of
the upper second transfer plate 144.
[0145] Further, a fourth guide bar 159 rotating and down-supporting
the upper second transfer plate 144 separated from the third guide
rail 145 is installed from the bottom to the top of the second
driven sprocket 142 along the side. A fourth trigger 159a is
coupled to the end of a fourth guide bar 159 and the fourth trigger
159a is constituted by the axial rotating roller. The fourth
trigger 159a is installed at a position which is in contact with
one side of the plane of the lower second transfer plate 144.
[0146] In addition, in the first transfer plate 114, a plurality of
through-holes 114a is formed so that the reheat steam injected from
the first steam chamber 120 and the second steam chamber 123 passes
through the first transfer plate 114 to contact the coal particles.
At upper left and right sides of the first transfer plate 114, a
guard 114b having a predetermined height is installed to prevent
the input coal pile from flowing in a left or right direction of
the first transfer plate 114. The guard 114b has a shape that is
wide at the top and narrow at the bottom as a substantially
trapezoidal shape. Accordingly, the top of the guard 114b of the
first transfer plate 114 is overlapped with an adjacent guard 114b.
In this case, the guard 114b of the first transfer plate 114 is
installed in a substantially zigzag direction with the adjacent
guard 114b. Further, at lower left and right sides of the first
transfer plate 114, shield plates 114c are installed to prevent the
reheat steam injected from the first steam chamber 120 and the
second steam chamber 123 from being lost when injected to left and
right sides of each of the first steam chamber 120 and the second
steam chamber 123.
[0147] In addition, in the second transfer plate 144, a plurality
of through-holes 144a is formed so that the reheat steam injected
from the third steam chamber 150 and the fourth steam chamber 153
passes through the second transfer plate 144 to contact coal
particles. At upper left and right sides of the second transfer
plate 144, guards 144b having a predetermined height are installed
to prevent the input coal pile from flowing in a left or right
direction of the second transfer plate 144. The guard 144b has a
shape that is narrow at the top and widened at the bottom as the
substantially trapezoidal shape. Accordingly, the top of the guard
144b of the second transfer plate 144 is overlapped with an
adjacent guard 144b. In this case, the guard 144b of the second
transfer plate 144 may be installed in the substantially zigzag
direction with the adjacent guard 144b. Further, at lower left and
right sides of the second transfer plate 144, shield plates 144c
are installed to prevent the reheat steam injected from the third
steam chamber 150 and the fourth steam chamber 153 from being lost
when injected to left and right sides of each of the third steam
chamber 150 and the fourth steam chamber 153.
[0148] In addition, in FIG. 35a, the upper first transfer plate 114
is transferred to the end of the first guide rail 115 by rotating
the first driven sprocket 112. In FIG. 35b, while the lower left
side of the upper first transfer plate 114 deviates from the end of
the first guide rail 115, the lower right side of the upper first
transfer plate 114 is in contact with the second trigger 119a of
the second guide bar 119. In this case, in the upper first chain
113, the upper first transfer plate 114 hinge-coupled to the first
transfer roller 133 is separated from the first guide rail 115 and
simultaneously rotates in a left direction of the first transfer
roller 133 as an axis to drop down the loaded coal pile. In
addition, in FIG. 35c, the bottom of the upper first transfer plate
114 moves downward along the second trigger 119a. In FIG. 35d, the
upper first transfer plate 114 is maintained in a substantially
vertical state and moves without pivoting along a rotation radius
of the first driven sprocket 112 while the bottom contacts the
second guide bar 119. In FIG. 35e, while the upper first transfer
plate 114 transferred downward moves up to the second guide rail
116, the coal pile dropped down from the first transfer plate along
the lower first transfer plate 114 is loaded and transferred. In
addition, the coal pile loaded on the lower first transfer plate
114 is transferred and dried by the reheat steam.
[0149] Next, in FIG. 34a, the lower first transfer plate 114 is
transferred to the end of the second guide rail 116 by rotating the
first drive sprocket 111. In FIG. 34b, while the lower right side
of the lower first transfer plate 114 deviates from the end of the
second guide rail 116, the planar left side of the lower first
transfer plate 114 is in contact with the first trigger 117a of the
first guide bar 117. In this case, in the lower first chain 113,
the lower first transfer plate 114 hinge-coupled to the first
transfer roller 133 is separated from the second guide rail 116 and
simultaneously rotates in a left direction of the first transfer
roller 133 as an axis to drop down the loaded coal pile. In
addition, in FIG. 34c, the plane of the upper first transfer plate
114 moves upward along the first trigger 117a. In FIG. 34d, the
lower first transfer plate 114 is maintained in a substantially
vertical state and moves without pivoting along the rotation radius
of the first drive sprocket 111 while the plane contacts the first
guide bar 117. In FIG. 34e, while the lower first transfer plate
114 transferred upward moves upward of the first guide rail 115,
the lower first transfer plate 114 becomes the upper first transfer
plate 114, and as a result, the coal pile input from the coal
constant feeder 400 with a predetermined amount along the upper
first transfer plate 114 is loaded and transferred. In addition,
the coal pile loaded on the upper first transfer plate 114 is
transferred and dried by the reheat steam. The coal pile dropped
from the lower first transfer plate 114 is discharged to an outlet
131 along a first slope 139.
[0150] Further, the coal pile dropped from the first coal dryer 110
to the outlet 131 is input to an inlet 160 of the second coal dryer
140, input on the surface of the second transfer plate 144 of the
second coal dryer 140, and then transferred. In addition, the coal
pile loaded on the upper second transfer plate 144 is transferred
and dried by the reheat steam.
[0151] The transfer process of coal in the second coal dryer 140 is
the same as the transfer process of the first coal dryer 110. In
addition, the coal pile dropped from the lower second transfer
plate 144 is discharged to an outlet 161 along a second slope 149.
In addition, the coal pile dropped from the second coal dryer 140
to the outlet 161 is naturally dried while being supplied and
transferred to the third coal dryer 170.
[0152] In the present invention, the steam supply pipe 121
supplying hot reheat steam generated from the reheater 500 is
connected to one side of the first steam chamber 120 and the second
steam chamber 123, and the steam supply pipe 151 supplying hot
reheat steam generated from the reheater 500 is connected to one
side of the third steam chamber 150 and the fourth steam chamber
153. In addition, a perforated plate 10 for first steam
distribution through-formed with a plurality of first steam
injection holes 11 is coupled to and installed in the inner upper
part of each of the first steam chamber 120, the second steam
chamber 123, the third steam chamber 150, and the fourth steam
chamber 153. In each of the first steam chamber 120 to the fourth
steam chamber 153, the reheat steam having uniform pressure is
injected through the first steam injection holes 11.
[0153] The apparatus for adjusting steam pressure in the system for
drying coal using reheat steam according to the present invention
is configured to inject the high-temperature reheat steam at
uniform pressure through the plurality of through-holes which
penetrate on the transfer plate while transferring the coal for
drying onto the plurality of transfer plates transferring the coal
to effectively dry the coal by depriving the moisture included in
the coal and has an advantage in that the high-temperature reheat
steam evenly contacts the coal particles and the porosity.
[0154] While the present invention has been described with respect
to the specific embodiments, it will be apparent to those skilled
in the art that various changes and modifications may be made
without departing from the spirit and scope of the invention as
defined in the following claims.
INDUSTRIAL APPLICABILITY
[0155] In the system for drying coal using reheat steam according
to the present invention, incomplete combustion of coal is
prevented by removing moisture which remains on the surface and to
the inside of coal which is used fuel of a thermal power plant by
injecting high-temperature reheat steam onto the surface of the
coal and to the inside of the coal at uniform pressure in a
multi-stage coal dryer to enhance a caloric value of the coal and
minimize emission of pollutant materials and enhance stability of
coal supply by increasing utilization of low-grade coal having a
small demand, and as a result, there is industrial
applicability.
* * * * *